Tool-holder for capstan and the like lathes.



R. 1. HARDING. TOOL HOLDER FOR CAPSTAN AND THE LIKE LATHES.

Patented June 11, 1918.

APPLICATWN FILED OCT. 9, 19l6- bk I Ag ROBERT JAMES HARDING, or LAMBETH,LONDONLENGLAND.

TOOL-HOLDER FOR CAPS'IAN AND THE LIKE :t'nrnns,

Application filed November 9, 1916.

To all whom it may concern:

Be it known that I, ROBERT JAMns HA RD- ING, works manager, a subject ofthe King of'Great Britain, residing at Burrup Place, Doris street,Lambeth, London, S. E., En land, have invented new and usefulImprovements in Tool-Holders for Capstan and the like Lathes; and I dohereby de clare the following to be a full, exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to tool holders for capstan and the like lathes,and conslstsessentially in the hereinafter descrlbed con struction oftool post, and combination and arrangement therewith of the variousparts for the setting and adjustment of the tools, whereby accuracy andease in these operations are obtained, and a quick release of the toolpost in its slide is possible so that 1ts position relative to the workmay be var ed with facility without disturbing the setting of the toolsin the holder.

The tool holder, in accordance with this invention, is constructed tohold two tools either of which is made use of as required. The tools aremuch closer together than in other holders and I provide means wherebyeach tool rest is capable of being tilted to a certain extent at eitherend, and set at the desired rake whereby slightly varying diameters ofwork may be operated upon by either tool.

And in order that my invention may be fully understood and readilycarried into effect I will proceed to describe the same with referenceto the accompanying drawings and letters and figures of reference markedthereon, that is to say Figures 1 and 2 are respectively front and sideelevational views of the device constructed in accordance with thisinvention, certain parts being broken away and others shown in section.

Fig. 3 is a plan of Fig. 2 and Fig. 4 is a sectional plan on the line H,Fig.1. Similar letters of reference indicate like parts in each of thefigures where occurring.

In carrying my invention into effect I make the tool post a in the formof a frame in which the tools 6 are mounted independently of each otherand close together. The base of the tool post a is tonguecl' (seeparticularly a Fig. 2) and works in a correspondingly shaped groove inthe bed of the Specification of Letters Patent.

clear, and

tool in position upon Patented June 11, 1918. Serial No. 130,369.

machine (not'shown) so as to be capable of a sliding traverse across themachine.

The tool rests d are supported upon-the heads of screws 0 which screwinto the block f mounted within the lower part of the opening in thetool post a. One ofthese screws 6 is provided for the support of eachend of each tool rest and according to the relative heights to whichthese screws 6 are adjusted So may each tool be set-either perfectlyhorizontal -or downwardrake as'may be required. Set screws it passingthrough the upper part of the tool post a serve to securely hold eachits respective tool rest cl. it are packing pieces interposed betweenthe ends of the screws h and the upper surface of the tools 6.

A pin or bolt 9 passes through the above mentioned block 7 to supportsame in the tool post and takes its bearings at each end in the sides ofthe frames a. The ends of this pin or bolt 9 are concentric but itscenter part 9 is made eccentric for the purpose hereinafter explained.

The under side of the said block 7 is bored out centrally to a requireddepth to accommodate a spiral spring j the free end of which rests uponthe upper surface of the bottom bar of the frame forming the tool posta.

The spring j is intended to keep the tools in position as originally setWhen the eccentric portion of the pin 9 is in its inoperative positionand the screws it are slackened off as the spring will then elongate.

y giving a part turn to the pin 9 (the head of which is shaped to allowof the use of a turn screw, spanner or the like) the action of itseccentric portion tends to secure the tool post in its required positionin the T slot of the machine bed.

At the same time, byreason of the tongued part c of the tool post afitting in a groove in the bed of the machine as aforesaid, the pressureexerted as above expressed tends to hold the tool post more rigidly andfirmly to the machine, and the tool post thus being first secured in theT slot, makes it possible to set the tools in a rigid tool post, whichis a very great advantage.

When at any time it is desired to shift the position of the toolholderacross the machine to which it is clamped in the aforesaid manner it isonly necessary to' slightly slacken the top screws h and give a partturn with an upward or I to the screw 9 in the reverse direction to thatpreviously given to bring its eccentric portion into action, when thetool post may be slid along the groove to its required position withoutany disturbance to or disarrangement of, the adjusted tools.

What I do claim as my invention and desire to secure by Letters Patentis 2- 1. The combination with a lathe bed of a tool holder including apost adjustably mounted on the bed, a tool supporting block looselycarriedby the post for movement toward and away from the bed, a tool supporting member adjustably carried by the block, means carried by thepost for clamping a tool to said adjustable supporting member and meansfor moving the block to hold the post against movement with respect tothe bed, said means comprising a shaft journaled in the post andincluding an eccentric portion engageable with the block to clampinglyhold said block against the lathe bed.

Copies oi this patent may be obtained for five cent 2. The combinationwith a lathe bed of a tool holder including a post adjustably 25 mountedon the bed, a tool supporting block loosely carried by the post formovement toward and away from the bed, a tool supporting memberadjustably carried by the block, means carried by the post for clampinga tool to said adjustable supporting member, means for moving the blockto hold the post against movement with respect to the bed and a springdisposed between the post and block to urge said block and its toolsupporting means toward the tool clamping means of the post.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

ROBERT JAMES HARDING.

Witnesses:

W. H. FAwKEs, H. STEVENs.

3 each, by addressing the Commissioner of Patents.

Washington, ID 63.

